Davaineid Cestode from a Wallaby. 609 
Discussion. 
Fuhrmann, in 1920, separated from theold genus Davainea, 
Bl., four new genera, limiting the genus Davainea to those 
small forms possessing a restricted number of segments 
(4-15), small suckers, feeble musculature, regularly alter- 
nating genital pores, and uterine capsules possessing only a 
single onchosphere. Three of his new genera comprise 
only four species, whereas his fourth—Rai/lietina—includes 
almost 90 species. This genus he characterises as follows :— 
**Cestodes 4 scolex arrondi surmonté d’un rostre de structure 
simple, armé d’une couronne double (rarement simple ?) de 
crochets nombreux, petits et d’une forme spéciale. Ventouses 
plus ou moins arrondies, entourées de plusieurs rangées 
de petits crochets ou spicules, cadues ou persistant pendant 
toute la vie. Pores génitaux unilatéraux ou irréguliérement 
alternes. Utérus manquant dans les proglottis mars ; a sa 
place des capsules parenchymateuses renfermant une ou 
plusieurs onchosphéres.” 
He further subdivides the genus Ruillietina into four sub- 
genera, basing his differentiating characters on the position, 
unilateral or irregularly alternating, of the genital pores, and 
on the number of onchospheres, single or more, contained 
in each uterine capsule. 
Referring the species described above to this new grouping 
of the Davaineas, it is seen that it belongs to the genus 
Raillietina and to its subgenus Paroniella. This subgenus 
is characterised by having unilateral genital pores and the 
uterine capsules contain only a single onchosphere. 
From the available literature dealing with cestodes from 
Marsupials it appears that sixteen cestode genera have been 
recorded from this group of Mammals. These cestodes, 
together with Razllietina (Paroniella) macropa, sp. n., are 
practically all Cyclophyllids, only one genus— Bothrio- 
cephalus—belonging to another order, namely Pseudo- 
phyllidea. Of the Cyclophylhdean families all are repre- 
sented except two—namely, the families 'Tetrabothriidze and 
~ Mesocestoidide. 
I wish to express my indebtedness to the Zoological 
Society of London for the opportunity offered of collecting 
these parasites at their prosectorium. My thanks are also 
due to Mr. R. I. Pocock, F.R.S., for valuable assistance in 
the classification and nomenclature of the marsupial hosts. 
The appended host list is an attempt towards the com- 
pulation of all the cestodes which have been described or 
